Improved Photocatalytic and Antibacterial Activity of Mg0.33Ni0.33Co0.33GdxFe2‐xO4 Nanoparticles Synthesized via the Co‐precipitation Method

Author:

Rabaa Mariam1,Mezher Malak2,Aridi Amani13,Naoufal Daoud3,Khalil Mahmoud24,Awad Ramadan56

Affiliation:

1. Chemistry Department Faculty of Science Beirut Arab University Beirut P.O. Box 11-5020 Lebanon

2. Department of Biological Sciences Faculty of Science Beirut Arab University Beirut P.O. Box 11-5020 Lebanon

3. Inorganic and Organometallic Coordination Chemistry Laboratory Faculty of Sciences I Lebanese University Hadath P.O. Box 6573/14 Lebanon

4. Molecular Biology Unit Department of Zoology Faculty of Science Alexandria University Alexandria 21568 Egypt

5. Physics Department Faculty of Science Beirut Arab University Beirut P.O. Box 11-50205020 Lebanon

6. Physics Department Faculty of Science Alexandria University Alexandria 21568 Egypt

Abstract

AbstractThis study reports the synthesis of Mg0.33Ni0.33Co0.33GdxFe2‐xO4 nanoparticles (NPs) with 0.00≤x≤0.08 by the co‐precipitation method. The structural and optical properties of NPs are investigated. As Gd content increases, the lattice parameter and the bandgap energy increase whereas the particle size decreases. The photocatalytic performance of NPs is evaluated in the degradation of methyl violet (MV) dye under sunlight irradiation. The best activity is exhibited by Mg0.33Ni0.33Co0.33GdxFe2‐xO4 where x=0.04. The rate of the photodegradation reaction is boosted by increasing the pH and temperature. 95.4 % of MV is degraded after 240 min upon the addition of 5 wt. % carbon dot. The NPs are tested against Gram‐positive (Staphylococcus aureus and Enterococcus faecium) and Gram‐negative bacteria (Escherichia coli and Leclercia adecarboxylata) isolated from wastewater. The antibacterial activity was tested by the minimum inhibitory concentration and minimum bactericidal concentration broth microdilution assay, agar well diffusion assay and time‐kill test. The results show that the NPs exhibit inhibitory activity against Gram‐positive bacteria. Furthermore, NPs show bacteriostatic activity after 3 hours of incubation. The antibiofilm activity of the NPs is tested by the inhibition of biofilm formation and the destruction of pre‐formed biofilm assays. The results show an inhibitory activity of the NPs against Gram‐positive biofilms.

Publisher

Wiley

Subject

General Chemistry

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